...rtunately, the Pays and Constitutionnel do. It was these worthy sheets that made the discovery about the Spanish waters turn of affairs and they own to having imbibed the idea from the last letter of Dr. Russell .--How handy all that will be, and how easy the transition of the English, French, and Spanish fleets from Mexican to American waters. Mr. Seward was but too well in spired when he asked for increas...